Update accname/index.html

Author: scottaohara

accname/index.html

@@ -639,7 +639,8 @@ <h4>Computation steps</h4>
                 <li id="comp_host_language_label">
                   <span id="step2E"><!-- Don't link to this legacy numbered ID. --></span><em>Host Language Label:</em> Otherwise, if the <code>current node</code>'s native markup provides an
                   [=attribute=] (e.g. <code>alt</code>) or [=element=] (e.g. HTML <code>label</code> or SVG <code>title</code>) that defines a text alternative, return that alternative in the form of
-                  a <code>flat string</code> as defined by the host language, unless the <code>current node</code> is exposed as presentational (e.g., <code>role="none"</code>).
+                 a <code>flat string</code> as defined by the host language, unless the <code>current node</code> is exposed as presentational (<code>role="presentation"</code> or
+                  <code>role="none"</code>).
                   <div class="note">
                     See <a href="https://www.w3.org/TR/html-aam-1.0/#accessible-name-and-description-computation">HTML-AAM</a>,
                     <a href="https://www.w3.org/TR/svg-aam-1.0/#mapping_additional_nd">SVG-AAM</a>, or other host language documentation for more information on markup that defines a text alternative.